单词：total nitrogen balance
total nitrogen balance的用法和样例：
例句
- No adverse reaction was observed in both groups.Conclusions Ala-Gln-supplemented PN improved nitrogen balance and maintained intestinal permeability ,reduced complications.结论添加谷氨酰胺的肠外营养可以维持肠粘膜通透性，进一步改善氮平衡，减少并发症。
- Dietary fiber does not have significant effect on protein metabolism and nitrogen balance, but some fiber can decrease the absorption and availability of lipids and carbohydrates.膳食纤维对于蛋白质代谢及氮平衡的影响不大，但可减少脂类和碳水化合物的吸收及利用。
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